Incredible effect of focusing collimator block on sharpness & visibllity spectral lines Sol’Ex 5/6/2024
Slight focusing movements only required – amazing effect!
Andy
![](https://i0.wp.com/astronomy.me.uk/wp-content/uploads/2024/06/Incredible-effect-of-focusing-collimator-block-on-sharpness-visibllity-spectral-lines-SolEx-050624@0830-1024x550.jpg?resize=800%2C430&ssl=1)
Andrew Thornett, Lichfield, England, M6THO, andrew (at) thornett (dot) net
Slight focusing movements only required – amazing effect!
Andy